See if calibration of ustar and/or VPD leads to similar model performance of PM-models as PT-model

The only difference between the PT and PM models is the wind and VPD sensitivity of the PM model. If that sensitivity is way off, this would result in a vastly worse performance than the PT model. If we calibrated either wind or VPD, we could correct for such a bias, and the model should essentially behave similarly to the PT model.